Knife for lifting inside cord layers of casings



Jan. 27, 1931. w. MIKITTA 1,790,014

KNIFE FOR LIFTING' INSIDE CORD LAYERS OF CASINGS "Filed Oct. 22. 192

INVENTOR.

BYMW I I},

ATTORNEY.

Patented Jan. 2?, 15*31 WILLIAM MIKITTA, OF CLEVELAND, OHIO igaaen KNIFE FOR LIFrIne INSIDE corn) LAYERS or oasrnes Application filed October 22, 1928. Serial No. 314,024.

Theobjects of the invention are to provide an improvement in knives employed in repairing the tire casings to be used for severing and lifting the several cord layers there- 5 in so that suitable new cord layers can be applied and vulcanized thereto. 7

A knife for this purpose for ready and convenient use must be so constructed that it can be used in eitherhand and can be made to e 10 cut backwards or forwards, and the cutting edge must be extended at an angle to the st 111 and handle portion. The cutting points must not project beyond the one layer being cut, so that there will be no danger of cuttinginto an adjoining layer or layers.

Furthermore the knife should be provided with a conveniently positioned point which can be inserted in the cut to lift the severed edges thereof so that-the layer can be removed from the casing.

It comprises a knife having the capability of cutting backwards or forwards and at either the right or left side of the injury in the casing, and across the ends thereof and of easily turning the corners, and is hereinafter more fully described, illustrated in the accompanying drawings and particularly expressed in the claims.

in the accompanying drawings Fig. 1 is a perspective illustrating the use of the device. Fig. 2 is a side elevation of the knife. Fi 3 is an edge elevation thereof. Fig. l is an end elevation thereof. Fig. 5 is a transverse section thereof, and Fig. 6 is a section of the casing showing the manner of cutting through. one cord layer without disturbing the adjoining layer.

In these views A is the main blade of the knife, the side edges B B of which are in clined at a suitable angle approximately 30 degrees to the longitudinal axis of the handlev and the blade terminates in a bevelled and rounded point C.

The side edges of the main'blade are provided with integral V shaped cutting blades D D that project at right angles therefrom and are pointed at their outer at E E.

The inclined edges of the blades are grooved at F- F and these grooves are cut.

so through the inclined edges of the cutting blades thus forming projecting points G, G,

and recessed edges G that sever the cord raver,

and permit the cutting blades to pass thereunder as shown in Figs. 1 and 6.

These points must not be long enough to pierce the layer beneath, and the grooves F iustnot be widefenough at this point to permit such action.

p The blades are pointed at each end so that the, knife can be moved backwards or for-v wardslwithequally good effect, also a cutting blade'is'constructed on each side of the main blade; said blades being inclined at similar angles tothe longitudinal axis of the handle, .thus permitting; the workman to out upon either side of the injury in the tire,at pleasure, the inclination of the handlepermitting it to be grasped by the hand while the tool is being'used, and the double edge and opposite pointed cutting edges per: mitting it to be used interchangeably in either direction, backwards or forwards, and to cut on either sideof the injury, also the flat and bevelled end ofthe main blade permits turning the tool easily in the cut to change its direction therein, and is easily slipped underneath the "cord layer, to lift the secured portion.

' Having described the invention what I claim as new and desire to secure by Letters Patent 1s: I

1. In knife of the character described, a flat body having a pointedouter end and having oppositely and outwardly inclined sides and upwardly extended cutting blades integrally attach-ed to'the edges of said inclined sides. 7 p

2. In a knife of the character described, a flat body having a' pointed end and aninclined side, and an outwardlyweig nded cutting blade attached tojs'aid inclinedside,,thc point of said body being bevelled and the angle of juncture between said body and bladebeing grooved in continuation of the bevel on said bevelled point. I

3. In knife of the character described, a

oppositely inclined longitudinal edges, and

' flat body having abevelled central point and I inclined cutting blades secured at an angle] to said inclined edges, the angles of juncture between said blades and body, being grooved in continuation of the bevel of said pointed end the terminal edges 01": said grooves being cut away to permit said blades to operate in each direction. In testimony whereof I afiix my signature.

WILLIAM *MIKITTA. 

